EP0033430B1 - Verfahren zur thermo-optischen Aufzeichnung von Informationen und Informationsträger zur Durchführung dieses Verfahrens - Google Patents

Verfahren zur thermo-optischen Aufzeichnung von Informationen und Informationsträger zur Durchführung dieses Verfahrens Download PDF

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Publication number
EP0033430B1
EP0033430B1 EP80401854A EP80401854A EP0033430B1 EP 0033430 B1 EP0033430 B1 EP 0033430B1 EP 80401854 A EP80401854 A EP 80401854A EP 80401854 A EP80401854 A EP 80401854A EP 0033430 B1 EP0033430 B1 EP 0033430B1
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EP
European Patent Office
Prior art keywords
metal layer
layer
inscription
sublayer
information
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Expired
Application number
EP80401854A
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English (en)
French (fr)
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EP0033430A1 (de
Inventor
Jean Cornet
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Thales SA
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Thomson CSF SA
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0045—Recording
    • G11B7/00452—Recording involving bubble or bump forming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/009—Working by laser beam, e.g. welding, cutting or boring using a non-absorbing, e.g. transparent, reflective or refractive, layer on the workpiece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/18—Working by laser beam, e.g. welding, cutting or boring using absorbing layers on the workpiece, e.g. for marking or protecting purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/28—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using thermochromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat- decomposable compounds, e.g. gas- liberating
    • B41M5/288—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using thermochromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat- decomposable compounds, e.g. gas- liberating using gas liberating compounds, e.g. to obtain vesicular or blow-up images
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/007—Marks, e.g. trade marks
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
    • G11B2007/24302—Metals or metalloids
    • G11B2007/24304—Metals or metalloids group 2 or 12 elements (e.g. Be, Ca, Mg, Zn, Cd)
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
    • G11B2007/24302—Metals or metalloids
    • G11B2007/24308—Metals or metalloids transition metal elements of group 11 (Cu, Ag, Au)
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
    • G11B2007/24302—Metals or metalloids
    • G11B2007/2431—Metals or metalloids group 13 elements (B, Al, Ga, In)
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
    • G11B2007/24302—Metals or metalloids
    • G11B2007/24312—Metals or metalloids group 14 elements (e.g. Si, Ge, Sn)
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
    • G11B2007/24302—Metals or metalloids
    • G11B2007/24314—Metals or metalloids group 15 elements (e.g. Sb, Bi)
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
    • G11B7/2572—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of organic materials
    • G11B7/2575—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of organic materials resins

Definitions

  • the present invention relates to the recording by thermo-optical means of information capable of being read optically. It relates more particularly to a thermo-otpic recording process using a low power laser and a thermosensitive support which authorizes on the one hand the reading of the information immediately after their recording without intermediate stage of development and on the other hand the copy of the information by a global and fast method without deterioration of the original engraving or modification of any one of the characteristics of the engraving during the copying process.
  • the structures proposed for recording information with low power lasers generally proceed by thermal ablation. This is the case, for example, with layers of tellurium, bismuth or glassy chalcogenide alloy and even certain metallic layers deposited on organic, thermally degradable undercoats.
  • the information is stored in the form of holes in these structures and the holes create, during reading, an amplitude contrast which makes it possible to detect the information.
  • the copying of this information cannot be carried out in a simple and rapid manner, for example using the polymerization process which consists in forcing a liquid to penetrate into the hollow of the relief then to harden it by an appropriate means (thermal or photonics).
  • This duplication technique transforms the amplitude contrast of the original into phase contrast, that is to say that the copies cannot be read with the same reading device as that which makes it possible to read the original.
  • To keep the amplitude contrast when copying it is necessary to use a photographic or holographic type technique.
  • the photographic technique in this case presents serious drawbacks insofar as it requires excellent contact between the emulsion and the recorded surface of the original, which is generally difficult to achieve in the whole range of supports to be put in contact, as a result of dust.
  • it is necessary to operate in a dark room with high quality optical instruments and to use very high resolution emulsions.
  • the holographic technique requires bulky equipment.
  • the latter is a liquid which behaves like a solvent and consequently causes the mechanical properties of the polymer to drop, in particular its hardness and its softening point.
  • special care must be developed during the subsequent deposition of the metal layer so as not to introduce any mechanical stress into the organic layer which is capable, by relaxing, of altering the morphology of the structure as well before only after information has been stored.
  • the metal layer must be deposited at very low speed, be perfectly stainless, have low hardness, low mechanical rigidity and poor adhesion to the organic layer.
  • the information medium is difficult to handle without special precautions.
  • any protective layer thermalsetting or photocurable resin, varnish, etc.
  • the only acceptable protection system is the use of a cover providing a free space above the sensitive layer, however this cover almost doubles the cost price of the information medium.
  • direct duplication techniques by polymerizable liquid or contact photography techniques cannot be envisaged for making copies from such a fragile structure.
  • the subject of the invention is a method of thermo-optical information recording consisting of heating superficially with the aid of a beam of radiation focused and modulated in intensity, a heat-sensitive information medium comprising at least one metallic layer which covers an organic sublayer, characterized in that the thermal energy released in the metallic layer by the impact of the beam causes gas evolution by local degradation of the organic sublayer; this gas evolution and the associated loss of adhesion creating in the metallic layer a stretching situated beyond the elastic limit and below the elongation of rupture of the ductile material constituting this metallic layer.
  • the invention also relates to an information medium comprising a sub-layer organic layer covered with at least one metallic layer, characterized in that the localized heating of the metallic layer in the impact zone of a focused radiation beam generates a gassing by local degradation of the organic sublayer; this gas evolution and the resulting loss of adhesion cause a plastic stretching of the metal layer which is located beyond the elastic limit and below the elongation at break of the ductile material constituting this metal layer.
  • Figure 1 is a sectional view of an information carrier writable thermo-optically by means of the radiated energy contained in an inscription beam 4 focused by a lens 5.
  • the information to be entered is generally presented in the form of an angularly modulated electrical signal; this signal modulates the intensity of the beam 4 for example by means of an optical modulator with electrical control not shown in FIG. 1.
  • the radiated energy is produced by a coherent light source, in order to obtain by focusing tion on the surface of the information medium a spot of very small dimensions.
  • a raised imprint is formed and it is in the form of a succession of protuberances of non-uniform length and spacing.
  • An amplitude contrast may coexist, when the relief obtained causes a thinning of the support structure, because this mechanical effect, consequence of a stretching of a thin layer, causes a variation in transmittance or optical reflectance.
  • thermosensitive support of FIG. 1 comprises a substrate 1 covered by a sublayer 2 of organic substance, which is in turn covered by a metallic layer 3.
  • FIG. 2 shows the appearance that takes the surface of the information carrier of FIG. 1 due to the heating of the sublayer 2.
  • a permanent imprint can be obtained after the passage of the writing beam 4 based on a cushioned expansion 7 of the sub-layer 2 which causes in the layer 3 a stretch a beyond the elastic limit.
  • the residual deformation obtained is illustrated in FIG. 3.
  • the raised impression has a bulge in the center 7 and this bulge is connected to the non-deformed parts of the layer 3 by a slight annular depression which results from the rebalancing of the stresses.
  • the organic material 2 of the sublayer 2 remains in contact with the layer 3.
  • the deformation without change of state which has just been described is compatible with a low power of the writing beam and it makes it possible to obtain an imprint of good readability when a highly plasticized polymer is used in the sub-layer 2.
  • the metal used has a low hardness. It follows that the information medium produced according to these prescriptions is completely devoid of mechanical strength.
  • the deposition of layer 3 on the sub-layer 2 must be done at a slow speed to avoid any stress liable to create wrinkling.
  • the structure using a soft layer deposited on a sub-layer of highly plasticized polymer is subject to drilling when the power threshold E v is reached for which the sub-layer degrades.
  • the drilling of layer 3 results in the appearance of a rim with poorly reproducible contours, which lowers the S / N ratio (signal to noise) of the fingerprint reading signal.
  • a metal which adheres better to the sub-layer 2 and a polymer material which is little or not plasticized is adopted for the latter.
  • the stretching beyond the elastic limit of layer 3 is due in large part to the formation of a gas bubble obtained by local degradation of sublayer 2.
  • the imprint produced according to these prescriptions is shown on the FIG. 4, where it can be seen that the layer 3 has peeled off from the sublayer 2 due to the localized degradation of the sublayer 2 with the formation of the crater 6.
  • the diagram in FIG. 5 illustrates the response characteristics of the two types of information carriers mentioned above; they are differentiated by their sensitivities to the radiation of inscription and by their mechanical resistances.
  • the power E of the writing beam has been plotted on the abscissa and the signal to noise ratio S / B that the reading of the imprint makes it possible to obtain on the ordinate.
  • the response characteristic 8 is obtained. Below the threshold of power E v which leads to a degradation of the sublayer 2, therefore to the left of the dotted line 9, it can be seen that an imprint of good readability can be obtained with a low writing power.
  • the degradation threshold E v is crossed, the characteristic 8 bends, because the degradation of the sub-layer 2 results in an inevitable piercing of the metal layer 3.
  • the response characteristic 10 relates to an information medium in accordance with the invention which has less sensitivity to writing, but which offers much better mechanical strength.
  • This support comprises a sub-layer 2 little or not plasticized and a harder and more adherent metal layer 3 thanks to the incorporation of an appropriate element.
  • the part of the characteristic 10 situated to the left of the line 9 indicates a weak signal-to-noise ratio, since the relief of the imprint is much less marked than with the information medium to which the characteristic 8 relates. This results from the lower coefficient of expansion of the polymer and the increase in the elastic limit of the metal shell 3.
  • FIG. 6 makes it possible to compare the elongation-tension curves of the metals constituting layer 3 of the two types of information carriers having respectively the response characteristics 8 and 10 of FIG. 5.
  • the proportional elongation is given on the abscissa on the diagram of Figure 6; on the ordinate, the mechanical tension has been taken a.
  • the curve 11 relates to a soft metal layer made of precious metal alloy without adjuvant .
  • An important stretching beyond the elastic limit may be obtained with a tension in A.
  • the unloading line 13 meets at A the axis of zero tension, which makes it possible to count on a significant imprint relief, because the permanent elongation OA is sensitive.
  • Such stretching justifies the good signal-to-noise ratio obtained despite the absence of degradation of the sublayer 2 in the case of characteristic 8 of FIG. 5.
  • Curve 12 relates to a metallic layer 3 of greater hardness.
  • the same mechanical tension o A barely exceeds the elastic limit situated above and the unloading line 14 shows that the plastic stretching gave rise to a low permanent elongation OB.
  • This situation corresponds to the part of characteristic 10 in FIG. 5 located to the left of line 9.
  • sublayer 2 causes the localized separation of the metallic layer 3 and the gas volume released causes an additional plastic stretching which may remain below the elongation at break OD of the metallic layer.
  • a permanent elongation OC is therefore obtained along the unloading line 15 which guarantees an excellent signal-to-read noise ratio as shown by the part of the characteristic 10 situated to the right of the line 9.
  • the information medium suitable for the implementation of this recording method comprises a sublayer 2 of a thermodegradable organic material having a thickness of the order of 10 to 300 nm and this sublayer (2) is covered with a thin metallic layer 3 having a thickness of the order of 5 to 10 nm.
  • the substrate 1 can be any, metallic, vitreous or organic, opaque or transparent, flexible or rigid, of any thickness as well.
  • the substrate 1 is transparent and rigid and has a thickness of between 1 and 1.5 mm.
  • the organic sublayer 2 is preferably chosen with a degradation temperature low, high hardness and low compressibility, so that the deformation resulting from the degradation of the polymer remains confined to the impact zone of the laser beam.
  • the metal layer 3 fulfills several functions.
  • the choice takes into consideration the ease of deposition in a thin or semi-thick layer over large surfaces, the microscopic quality of the layer: continuity, absence of granulation or other defects, its transparency and its adhesion to the substrate.
  • the organic sublayer 2 polymethyl methacrylate, polystyrene, polycarbonates, polysulfone, cellulose derivatives (nitrocellulose, cellulose acetate, ethylcellulose, cellulose acetobutyrate) .
  • These substances can in certain cases be obtained commercially in the form of thin or thick sheets so that it is the substrate 1 itself which plays the role of thermodegradable layer.
  • these substances can also be deposited on a substrate 1, by drawing or by centrifugation from solutions in simple solvents (acetone, cyclohexanone, acetyl acetate or the mixture of solvents defined under the name »AZ thinner "By the firm SHIPLEY.
  • simple solvents acetone, cyclohexanone, acetyl acetate or the mixture of solvents defined under the name »AZ thinner "By the firm SHIPLEY.
  • Other deposition methods can also be used such as sublimation under vacuum or sputtering.
  • plasticizers such as adipates, azelates and sebacates of isodecyl, butoxyethyl or ethylhexyl, or phthalates of isodecyl, cyclohexyl or ethylhexyl.
  • the metals are chosen as a function of their ductility, their resistance to deformation shock, their hardness, their slightly oxidizable nature and the possibility that they present of being able to produce thin layers. perfectly continuous and adherent to the polymer.
  • Ductility and impact resistance are generally obtained with alloys based on gold, silver or platinum in homogeneous phase.
  • the hardness and the adhesion are obtained by choosing as any addition element any of the elements Cu, Cr, Ni, AI, Sb, Ta, Ti, Mn, Si, Zr, Co, Pd insofar as the content of precious metal remains greater than or equal to 60% by weight so that the alloy retains a high resistance to oxidation and remains in the homogeneous phase of high ductility.
  • Ag-Pd-Cu dental alloys can be used.
  • other addition elements can be used without departing from the scope of the invention.
  • non-precious alloys can also be used such as aluminum bronzes (for example Cpo, Fe 7 , 5 , A1 22 , 5 ) or tin bronzes (for example C U70 , Sn 5 , Pb 25 ) as well as the Cu-Ni, Cu-Pd and Ni-Pd alloys which are known to have a high resistance to oxidation and nevertheless advantageous mechanical properties in the context of this invention.
  • the applicant has obtained excellent results with the alloy Cr 20 Au 80 (by weight).
  • All these metals allow the production of thin layers by vacuum evaporation and these layers have a known absorbing power of 50% for the incident radiation when the thickness of these layers is between 4 and 10 nm. Furthermore, annealing in an oxidizing atmosphere (for example at 55 ° C. for 48 h) makes it possible in certain cases, as in that of Cu-Au alloys, to considerably increase the hardness and the adhesion of the metallic layers without appreciably degrading their ductility.
  • One of the advantages of the invention is that the adhesion of the metal layer to the polymer and the existence of a large radial thermal gradient tends to confine the gas bubble at the center of the marking spot, that is to say to give a size deformation much smaller than that of the registration spot.
  • This size can be as small as 0.3 ⁇ m while leading to a signal to noise ratio greater than 50 db. This results in a transfer function having a cutoff frequency rejected at high frequency.
  • the size of the etching as well as the signal to noise ratio vary rapidly depending on the power of the writing beam as shown in characteristic 10 of FIG. 5. This results in the possibility of storing information on several levels by acting on the power (we are only limited by the power available, because there is never the formation of holes).
  • the effect of reducing the thickness of the metallic layer following its plastic deformation can be used to read the information contained in the imprint by the local decrease in reflectance and by the correlative increase in transmittance. There is therefore an amplitude contrast which complements the phase contrast linked to the relief of the imprint.
  • the thickness of the metal layer is small, its hardness and the mechanical rigidity of the polymer allow a easy handling of the information medium using only basic precautions, in particular for protection against dust and fingerprints. Under these conditions, the lifetime of the structure is very high. It may however be useful to protect the information contained in the sensitive layer more completely.
  • FIG. 11 shows a conventional embodiment of this protection using a cover 21 that an empty space spares above the metal layer 3.
  • the recording can be done by means of a light beam 4 which the substrate crosses, here constituted by the sublayer 2 and focused on the metallic layer 3 by a lens 5 of optical axis XX.
  • the protective cover 21 can be permeable to writing radiation and the substrate can be opaque if the reading is done by reflection. For reading by transmission, the two elements giving access to the metal layer 3 must be permeable to the reading radiation.
  • the sensitive layer 3 can, in fact, be protected without being degraded in any way, by virtue of a thick layer 16 of photo or thermopolymerizable resin, a varnish or a polymer deposited by wet process (printing , centrifugation ...) or dry (sublimation, sputtering).
  • This layer 16 can be deposited both before and after registration insofar as its hardness is not too high to oppose the growth of the deformation under the impact of the laser beam.
  • the layer 16 is a thermosetting silicone of the Sylgard 184 type from the company Dow Corning, a photopolymerizable acrylic lacquer, or a layer of nitrocellulose deposited by centrifugation from a 100 g / I solution. by AZ Thinner of SHIPLEY. It can be noted that the protection by thick layer which is described here is effective not only to protect the sensitive layer 3 from possible mechanical degradations, but it also protects it against corrosion insofar as the metal layer 3 is not perfectly stainless , which is the case for Cu-Au alloys with a very high copper content.
  • FIG. 8 we can see another mode of protection which consists in depositing on the recorded information medium a layer of metal 17.
  • This deposit can be carried out the metallic layer 3 by electrolysis of a metal with great mechanical and chemical resistance. for example nickel.
  • the structure which is the subject of the invention can be covered with a thick metallic layer 17 without the relief disappearing since it is still legible through the substrate 1.
  • the configuration defined by the information medium protected by a thick metallic layer 17 in the context of this invention is a particularly satisfactory structure when archiving of very long duration is desired.
  • a degradation of the substrate 1 is not detrimental to the reading of the information insofar as the damaged substrate and the under-layer 2 can be removed by dissolution in an appropriate solvent and replaced. by a new protective layer 18, for example a photopolymerizable resin as illustrated in FIG. 9.
  • the integral etching of the thick metallic layer 17 is not deteriorated.
  • the relief can be copied one or more times by a contact process.
  • FIG. 10 illustrates the process of overall copying of the engraving by means of a photo or thermopolymerizable liquid 19.
  • the copy can be made on rigid or flexible plastic support 20.
  • the information support is coated with a layer of liquid 19, then the support 20 for the copy is pressed against the liquid layer 19 to using a device allowing a continuous liquid film to be obtained without gas bubbles or other defects and of uniform thickness.
  • the polymerized resin 19 preferentially adheres to the support 20 of the copy, which allows complete separation of the copy 19- 20 of the original 1-2-3 without resulting in any deterioration either of the copy or of the original, the latter can then be used again either for additional registration or for a new copy.
  • the substrate 1 consists of a polymethyl methacrylate disc 356 mm in diameter and 1.5 mm thick .
  • This substrate 1 is covered with a sublayer 2 of nitrocellulose 500 nm thick deposited by centrifugation at the speed of 6 revolutions - S-1 from a solution of 8 g of nitrocellulose per liter of AZ Thinner.
  • the organic sublayer 2 is covered with a layer 3 of a Cr 20 Au 8o alloy (by weight) with a thickness close to 8 nm by vacuum evaporation at the speed of 0.3 nm - S -1.
  • the projection lens used has a numerical aperture of 0.45.
  • the disc being driven at the speed of 25 turns - S-1 and the inscription being made according to a radius of 130 mm, we obtained a succession of imprints of 0.4 ⁇ wide by 2.5 ⁇ m long with a high relief of 150 nm when the incident power was 8 mW.
  • the read signal measured at the spectrum analyzer and related to optical noise is at a level of 64 db for a 30 kHz band.
  • the relief could be copied by photopolymerization of an acrylic liquid on a rigid support 20 in polymethyl methacrylate using a UV lamp of 100 w power located at a distance of 18 cm.
  • the irradiation time was 12 seconds. Reading on a machine of conventional type did not make it possible to note any degradation of the reading signal for both the original and the copy.
  • the substrate 1 carries a plasticized organic sublayer 2 successively covered with a metallic sublayer 30, for example in gold, which is in turn covered with a harder metallic layer 3.
  • the metallic sublayer 30 makes it possible to obtain low stresses when deposited on an organic sub-layer 2 which is fairly highly plasticized.
  • the metal layer 3 can then be deposited taking fewer precautions.
  • Such a structure makes it possible to envisage an etching process in two phases. Firstly, by means of an inscription beam 4 which does not degrade the sub-layer 2, a continuous relief imprint materializing a prepiste is produced. In a second step, the relief 7 of this pre-track is engraved with a beam 40 modulated by the information, which amplifies it by virtue of the degradation of the under-layer 2. This gives a succession of protuberances having a relief 70 more accused as that of the prepiste.
  • the creation of a prepiste by degradation of the sublayer 2 is also compatible with the subsequent recording of the information.
  • the use of a prepiste can be conceived in two different ways. You can record the information on a track located next to the prepiste or record the information over the prepiste. The prepiste can implement a slight degradation of the organic sublayer or even a simple expansion without change of state of the organic sublayer.
  • the metal layer 3 can advantageously consist of one of the following alloys:

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  • Engineering & Computer Science (AREA)
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  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Optical Recording Or Reproduction (AREA)

Claims (18)

1. Verfahren zum thermo-optischen Niederschreiben einer Information, bei dem ein wärmeempfindlicher Informations-Träger, der mindestens eine eine organische Unterschicht (2) bedeckende Metallschicht (3) aufweist, oberflächlich mit Hilfe eines fokalisierten und intensitätsmodulierten Strahlenbündels erhitzt wird, dadurch gekennzeichnet, daß die sich in der Metallschicht (3) durch das Auftreffen des Strahlenbündels (4) entwickelnde Wärmeenergie eine Freisetzung von Gas durch örtliche Zersetzung der organischen Unterschicht (2) verursacht, wobei diese Freisetzung von Gas und der damit verbundene Verlust an Haftwirkung in der Metallschicht (3) eine Dehnung erzeugt, die die Elastizitätsgrenze übersteigt, aber unterhalb der Bruchlängung (D) des duktilen Materials bleibt, das diese Metallschicht (3) bildet.
2. Verfahren zum Niederschreiben nach Anspruch 1, dadurch gekennzeichnet, daß die organische Unterschicht (2) aus einem thermoplastischen Polymer besteht, das die Rolle eines Substrats spielt.
3. Verfahren zum Niederschreiben nach einem beliebigen der Ansprüche 1 und 2, dadurch gekennzeichnet, daß zwei Niederschreibphasen aufeinanderfolgen, um ein erstes dauerhaftes Relief zu erzeugen und um ein zweites dauerhaftes Relief zu bilden, wobei man sich von diesem ersten Relief leiten läßt.
4. Verfahren zum Niederschreiben nach einem beliebigen der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Metallschicht (3) nach dem Schreibvorgang durch einen Uberzug verstärkt wird.
5. Verfahren zum Niederschreiben nach Anspruch 4, dadurch gekennzeichnet, daß dieser Überzug ein elektrolytischer Überzug (17) ist, dessen Dicke ausreicht, um als endgültiger Träger der Metallschicht (3) zu dienen.
6. Verfahren zum Niederschreiben nach Anspruch 5, dadurch gekennzeichnet, daß die Unterschicht (3) und ihr ursprünglicher Träger entfernt und durch eine Schutzschicht (18) ersetzt werden.
7. Verfahren zum Niederschreiben nach einem beliebigen der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Metallschicht (3) nach dem Niederschreiben für die Übertragung eines Abdrucks verwendet wird, wobei diese Übertragung des Abdrucks mittels einer flüssigen Schicht (19) aus polymerisierbarem Material geschieht.
8. Verfahren zum Niederschreiben nach einem beliebigen der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der in die Metallschicht eingeprägte Abdruck durch eine Haube (21) geschützt wird.
9. Informationsträger für die Anwendung des Schreibverfahrens nach einem beliebigen der vorstehenden Ansprüche, der eine organische Unterschicht (2) aufweist, die mit mindestens einer Metallschicht (3) bedeckt ist, dadurch gekennzeichnet, daß die örtliche Erwärmung der Metallschicht (3) in dem Auftreffbereich eines fokalisierten Strahlenbündels (4) eine Freisetzung von Gas durch lokale Zersetzung (6) der organischen Unterschicht (2) hervorruft, wobei dieses Freisetzen von Gas und der daraus entstehende Verlust an Haftwirkung eine plastische Dehnung der Metallschicht (3) hervorrufen, die oberhalb der Elastizitätsgrenze und unterhalb der Bruchlängung (D) des duktilen Materials liegt, das diese Metallschicht (3) bildet.
10. Informationsträger nach Anspruch 9, dadurch gekennzeichnet, daß die organische Schicht (2) aus mindestens einem Polymer besteht, wobei die Metallschicht (3) aus einer Legierung besteht, die Edelmetalle der Gruppe Gold, Silber, Platin und ein Adjuvans aufweist, das die Haftfähigkeit gegenüber der organischen Schicht und die Widerstandsfähigkeit gegen den Verformungsschock erhöhen soll, und wobei dieses Adjuvans aus den Elementen Kupfer, Chrom, Nickel, Aluminium, Antimon, Tantal, Zirkonium, Kobalt, Palladium, Mangan, Silizium ausgewählt wird.
11. Informationsträger nach Anspruch 9, dadurch gekennzeichnet, daß die organische Schicht (2) aus mindestens einem Polymer besteht, wobei die Metallschicht (3) aus einer der Legierungen Aluminiumbronze, Zinnbronze, Kupfer-Nickel, Kupfer-Palladium, Nickel-Palladium, Kadmium-Antimon, Aluminium-Antimon, Kadmium-Chrom, Magnesium-Chrom und Aluminium-Chrom besteht.
12. Informationsträger nach einem beliebigen der Ansprüche 10 und 11, dadurch gekennzeichnet, daß das Polymer zu der Gruppe gehört, die die Polymethacrylate, die Polycarbonate, das Polystyren, die Derivate der Cellulose, das Polysulfon umfaßt.
13. Informationsträger nach Anspruch 12, dadurch gekennzeichnet, daß das Polymer plastifiziert wird, um seine Zersetzungstemperatur zu senken.
14. Informationsträger nach Anspruch 13, dadurch gekennzeichnet, daß der dem Polymer zugesetzte Weichmacher ein Adipat, Azelat, Isodecyl-, Butoxyäthyl- oder Äthylhexyl-Sebacat oder ein Isodecyl-, Cyclohexyl- oder Äthylhexyl-Phthalat ist.
15. Informationsträger nach einem beliebigen der Ansprüche 13 und 14, dadurch gekennzeichnet, daß die Metallschicht (3) durch eine metallische Zwischenschicht (30) von der organischen Unterschicht (2) getrennt ist.
16. Informationsträger nach einem beliebigen der Ansprüche 9 bis 15, dadurch gekennzeichnet, daß er Mittel zum Schutz der Metallschicht (3) aufweist.
17. Informationsträger nach Anspruch 16, dadurch gekennzeichnet, daß eines dieser Mittel aus einer dicken elektrolytischen Ablagerung von Metall besteht, die nach dem Niederschreiben der Information aufgebracht wird.
18. Informationsträger nach Anspruch 9, dadurch gekennzeichnet, daß die Metallschicht (3) von einer Metallablagerung bedeckt ist, die mit der Metallschicht zusammenwirkt, um einen widerstandsfähigen Abdruck zu bilden.
EP80401854A 1980-01-23 1980-12-23 Verfahren zur thermo-optischen Aufzeichnung von Informationen und Informationsträger zur Durchführung dieses Verfahrens Expired EP0033430B1 (de)

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FR8001423 1980-01-23

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DE3065566D1 (en) 1983-12-15
FR2474222A1 (fr) 1981-07-24
US4404656A (en) 1983-09-13
US4577291A (en) 1986-03-18
FR2474222B1 (de) 1984-09-14
EP0033430A1 (de) 1981-08-12
CA1159307A (en) 1983-12-27

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